Darkcoin will be implementing Ring Signatures and I2P, plus it's existing masternodes which is better anonymity than Monero/Bytecoin I'm sorry to say, we also don't know that much about the CryptoNite protocol.
"will be implementing" vs. "already in use"
Yeah, I think I'll stick to what works.
I2P is far from the holy grail for anonymity.
Also please don't talk about masternodes like they're a good thing, it's trivially easy to take out a significant portion (if not all) masternodes through a simple DDoS and keep a set of malicious masternodes online, giving someone like the NSA effective control of the path the coins take. So not only does it not provide "better anonymity" in actuality, but it provides an attacker with a neat way of controlling the flow of currency whilst still retaining the veil of anonymity.